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What is the working principle of the head cylinder
Apr 08, 2018

The working principle of cylinder is: single acting cylinder has only one cavity to enter compressed air to achieve unidirectional motion. The piston rod can only be driven by external force, usually by means of spring force, diaphragm tension and gravity. The single acting cylinder is characterized by only one end exhaust, simple structure and low gas consumption. The single acting cylinder has only one cavity, which can enter compressed air and achieve unidirectional motion. The piston rod can only be driven by external force, usually by means of spring force, diaphragm tension and gravity. The characteristics of the single acting cylinder are:

1: only one end (exhaust) gas, the structure is simple, and the consumption of gas is low.

2: make use of the force of spring or diaphragm, and use compressed air energy to overcome spring force or diaphragm tension, so as to reduce the force of piston rod.

3. The spring and diaphragm are installed in the cylinder.  Compared with the same volume double acting cylinder, the effective stroke is smaller.

4: the tension of cylinder reset spring and diaphragm changes with the change of deformation size, so the output force of piston rod changes during driving.

Because of the above characteristics, the single acting piston cylinder is mainly used for short stroke. Its thrust and speed are not high, such as gas lift, positioning and clamping device.  The single acting plunger cylinder is not, it can be used for long stroke and high load occasion.

Double acting cylinders refer to two chambers that enter compressed air to achieve a two-way pneumatic cylinder. The structure can be divided into double piston rod type, single piston rod type, double piston type, buffering type and non buffering type. This cylinder is widely used.

1) two kinds of double piston rod, double piston rod, cylinder block and piston rod.

The cylinder body is fixed, the load they carry (such as workbench), become an organic whole, and many times with the two cylinder piston rod compressed air to two chamber cylinder (1 chamber entrance one cavity exhaust), the piston rod drives the worktable, and the moving range of the worktable is equal to three times of its effective stroke. The installation occupies large space and is generally used for small devices.

The piston rod is fixed, the connection is convenient, the hollow piston rod and the cylinder are made into an organic whole. The compressed air from the right or left side is the two cavity of the hollow cylinder. The cylinder drives the worktable to move to the left or to the left, which can effectively travel the range of the 2 workstations. It is suitable for medium and large equipment.

1 piston rod; 2 piston; 3 buffer plunger; 4 column holes; 5 one-way seal; 6 throttle valve; 7 end cap, 8 hole.

When the cylinder is close to the end of stroke, it will not take necessary measures. The piston will impact the end cover with larger force (energy), causing vibration and damage. In order for the piston to move smoothly at the end of the stroke, there is no impact. A buffer is added to both ends of the cylinder, usually called the buffer cylinder. The buffer cylinder is mainly composed of piston rod 1, piston 2, buffer plunger 3, one-way seal ring 5, throttling valve 6, end cap 7 and so on.

The working principle is that when the piston moves to the right under the compressed air, the gas in the right cylinder of the cylinder is discharged through the hole of the cylinder plug hole 4 and the cylinder head. The piston movement is near the end of 3 at the end of the cylinder plug hole 4 on the right side, the piston continues to move to the right, and the residual gas is compressed in the right chamber of the cylinder, slowly passing through the throttle valve 6 and the air hole 8, and the pressure of the compressed gas can be cushioning if the piston and the total energy balance motion.  The end of the journey makes piston movement without influence. The size of the opening of the throttle 6 can be adjusted to control the air displacement, so as to determine the pressure in the compression volume (buffer chamber) to adjust the cushioning effect. If the piston reverses movement, the air can be compressed from the air hole 8, and the check valve can be directly opened to push the piston to the left side. If the opening of throttle valve 6 valve is fixed, it can not be adjusted. It is called the non adjustable buffer cylinder.


There are many kinds of buffers in the cylinder. The above is only one of them, and it can also be used on the pneumatic back road to achieve the purpose of cushioning.

4. Thin wall cylinder.

Features: cylinder and rod end die as a whole, connecting rod cap.


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